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MPL 20x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020130

GTIN/EAN: 5906301811367

5.00

length

20 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.9 g

Magnetization Direction

↑ axial

Load capacity

2.33 kg / 22.90 N

Magnetic Induction

370.68 mT / 3707 Gs

Coating

[NiCuNi] Nickel

0.394 with VAT / pcs + price for transport

0.320 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical parameters of the product - MPL 20x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020130
GTIN/EAN 5906301811367
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
length 20 mm [±0,1 mm]
Width 3 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.33 kg / 22.90 N
Magnetic Induction ~ ? 370.68 mT / 3707 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x3x2 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Physical modeling of the product - report

Presented information represent the result of a mathematical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
MPL 20x3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3700 Gs
370.0 mT
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
warning
1 mm 2103 Gs
210.3 mT
0.75 kg / 1.66 lbs
752.3 g / 7.4 N
safe
2 mm 1172 Gs
117.2 mT
0.23 kg / 0.52 lbs
233.7 g / 2.3 N
safe
3 mm 721 Gs
72.1 mT
0.09 kg / 0.20 lbs
88.5 g / 0.9 N
safe
5 mm 345 Gs
34.5 mT
0.02 kg / 0.04 lbs
20.3 g / 0.2 N
safe
10 mm 101 Gs
10.1 mT
0.00 kg / 0.00 lbs
1.7 g / 0.0 N
safe
15 mm 42 Gs
4.2 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
safe
20 mm 21 Gs
2.1 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe
30 mm 7 Gs
0.7 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Shear force (vertical surface)
MPL 20x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.47 kg / 1.03 lbs
466.0 g / 4.6 N
1 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
2 mm Stal (~0.2) 0.05 kg / 0.10 lbs
46.0 g / 0.5 N
3 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
5 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 20x3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.70 kg / 1.54 lbs
699.0 g / 6.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N

Table 4: Material efficiency (substrate influence) - power losses
MPL 20x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
1 mm
25%
0.58 kg / 1.28 lbs
582.5 g / 5.7 N
2 mm
50%
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
3 mm
75%
1.75 kg / 3.85 lbs
1747.5 g / 17.1 N
5 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
10 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
11 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
12 mm
100%
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N

Table 5: Working in heat (material behavior) - power drop
MPL 20x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
OK
40 °C -2.2% 2.28 kg / 5.02 lbs
2278.7 g / 22.4 N
OK
60 °C -4.4% 2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
80 °C -6.6% 2.18 kg / 4.80 lbs
2176.2 g / 21.3 N
100 °C -28.8% 1.66 kg / 3.66 lbs
1659.0 g / 16.3 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 20x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.06 kg / 11.17 lbs
4 866 Gs
0.76 kg / 1.67 lbs
760 g / 7.5 N
N/A
1 mm 3.01 kg / 6.64 lbs
5 705 Gs
0.45 kg / 1.00 lbs
452 g / 4.4 N
2.71 kg / 5.97 lbs
~0 Gs
2 mm 1.64 kg / 3.61 lbs
4 205 Gs
0.25 kg / 0.54 lbs
245 g / 2.4 N
1.47 kg / 3.24 lbs
~0 Gs
3 mm 0.89 kg / 1.97 lbs
3 106 Gs
0.13 kg / 0.29 lbs
134 g / 1.3 N
0.80 kg / 1.77 lbs
~0 Gs
5 mm 0.31 kg / 0.67 lbs
1 816 Gs
0.05 kg / 0.10 lbs
46 g / 0.4 N
0.27 kg / 0.61 lbs
~0 Gs
10 mm 0.04 kg / 0.10 lbs
690 Gs
0.01 kg / 0.01 lbs
7 g / 0.1 N
0.04 kg / 0.09 lbs
~0 Gs
20 mm 0.00 kg / 0.01 lbs
202 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
24 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
14 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
9 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
6 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
5 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
3 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Hazards (implants) - precautionary measures
MPL 20x3x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Mechanical watch 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Car key 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Impact energy (cracking risk) - collision effects
MPL 20x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 51.34 km/h
(14.26 m/s)
0.09 J
30 mm 88.88 km/h
(24.69 m/s)
0.27 J
50 mm 114.74 km/h
(31.87 m/s)
0.46 J
100 mm 162.27 km/h
(45.08 m/s)
0.91 J

Table 9: Corrosion resistance
MPL 20x3x2 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)

Table 10: Electrical data (Flux)
MPL 20x3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 748 Mx 17.5 µWb
Pc Coefficient 0.32 Low (Flat)

Table 11: Submerged application
MPL 20x3x2 / N38

Environment Effective steel pull Effect
Air (land) 2.33 kg Standard
Water (riverbed) 2.67 kg
(+0.34 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only a fraction of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020130-2026
Measurement Calculator
Magnet pull force

Magnetic Field

Other proposals

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 20x3x2 mm and a weight of 0.9 g, guarantees the highest quality connection. This rectangular block with a force of 22.90 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 20x3x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 20x3x2 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (20x3 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 20x3x2 mm, which, at a weight of 0.9 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 20x3x2 mm and a self-weight of 0.9 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the working part of the magnet is strong,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Due to the possibility of accurate shaping and adaptation to custom needs, magnetic components can be manufactured in a variety of forms and dimensions, which makes them more universal,
  • Wide application in future technologies – they serve a role in magnetic memories, drive modules, advanced medical instruments, and other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complex forms - recommended is cover - magnetic holder.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Magnetic strength at its maximum – what contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, taking into account:
  • using a sheet made of high-permeability steel, functioning as a ideal flux conductor
  • whose thickness is min. 10 mm
  • with a surface perfectly flat
  • under conditions of no distance (metal-to-metal)
  • under axial force vector (90-degree angle)
  • in neutral thermal conditions

Key elements affecting lifting force

During everyday use, the actual lifting capacity is determined by many variables, ranked from most significant:
  • Distance – the presence of foreign body (rust, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets
Medical interference

Warning for patients: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Protective goggles

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Finger safety

Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Avoid contact if allergic

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.

Caution required

Use magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their force.

Dust explosion hazard

Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Data carriers

Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, mechanical watches).

Swallowing risk

Always keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.

Phone sensors

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and GPS.

Operating temperature

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98